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Dec. 22, 1925 e M. STEVENS RUBBER FRICTION DRIVE RING Filed Sept 17, 1924 gmmtoz atkozmgo- 30 and edge views my ring, whereas Figure 5 the joint h Patented Dec. 1925.

UNITED STATES "PATENT oar-ice? GEORGE STEVENS, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR OF ONE-THIRD TO JOHN C. BALLE'ITI AND ONE-THIRD T0 WILLIAM C. ANDERSON,'BOTH OF SAN FRANCISCO, CALIFORNIA.

RUBBER FRICTION DRIVE RING.

Application filed September 17, 1924. Serial No. 738,317.

To all whom it may concern:

Be it known that I, Gnoaen M. STEVENS, a citizen of the United States, and a resident of San Francisco, county of San Fran- 'cisco, State of California have invented a new'and useful Rubber Friction Drive'Ring, of which the following is'a specification. This invention relates to friction driving wheels or disks in general and in particular to a rubber drive ring as used on certain can making machinery and known to the trade as a slitter ring, .This ring is-used and ordinarily consists of a solid soft rubher ring positioned in the groove of a flange on the machine and making it necessary in replacing the rin to strip the shaft erremove it from its fiarings, and the object of my invention is to provide a rubber slitter 2 ring having a special split joint whereby the rubber ring may be renewed easily and quickly without stripping the shaft.

In the drawings accompanying this application, I show several modifications of the -split joint applied to a slitter ring all embracing the same principles which make my ring a demonstrated success in regular use I on a number of machines.

Figures 1 and 2 show respectivelyin plan referred construction using a pair of threa ed sleeves and screws for 'fastening. the joint, Figures 3 and 4 show modifications in the'angularity of the joint using common screws, Figure 5 shows the joint applied on the side of the ring instead of the edge and Figure 6 is a cross section of the ring at the joint constructed as in Figure 1 and seated in place in the grooved flange of the machine. v

In .the figures 1 is a soft resilient rubber ring with a stepped split. joint so that the ring may be opened up.

The 'oint in Fi res 1, and 2 is formed along is e lines a- .c, the line b being sub- 4 stantially parallel to the side of the ring.

4 the jointc'b-c is shown.

7 In Figure with the line b exactly arallel, and in Figure 3' the 'oint ab 'c", the line b" is at a deci ed angle to the sides of-the' III as a friction drive disk In place of the b.c is shown applied to the side of the ring.

On opposite ends of the rubber ring forming the joi t are metal plates vulcanized into the rubber. These plates in all figures are designated D and are placed in the rubber at the joint surface so that whenthe joint is closed, the plates will lie against one another and are so secured by suitable screws. I

The plates extend into the solid part of the ring beyond the joint, as shown at d, and in Figure 3 the extending ends are bent at an angle, as shown at d to hook into the rubber, while in Figure 5 the extending ends d" are bent but slightly to follow the direction of the ring, and in allviews the plates are shown as terminating just short of. the ends of the ring to which they are respectively vulcanized.

To secure the joint, I preferably used threaded screws e passing into threaded sleeve f as shown in Figure '2 wherein the joint is partly shown in section along the line 22 of Figure 1. a

Co'untersunk holes are formed in both ends of the ring joint extending through both metal plates of a size to pass the threaded sleeves as shown, so that when the joint is tightened by the screws, the strain is taken entirely by the metal plates against the sleeves, and when the rin is joined and sprung into the grooved ange of the machine, as shown'in Figure 6, t e screws are confined by theflange wallls against working loose.

It should also be noted in this view that v the plates are set below the outer diameter of the rubber ring to rovide a large amount of rubber, as indicated at h, to take the wear of the drive.

screws may beused as shown in Figures 3, 4and5ate.-

Having thus described my invention, it

should be noted that it is not merely a splitv collar of .the common type, but it is a split soft rubber ring with a special reinforced joint preventing the joint from opening up at this-point of weakness, and also the rethreaded sleeves, plain periphery of the ring,and furthermore the ranged for position of the locklng screws form a cooperating combination with the flanges of the machine which overcomes any possibility of the. joint coming apart. w

I claim:

1. A soft rubber drive ring of the character described provided with a split "oint, said joint comprising overlapping en 5 with a reinforcing late vulcanized to each end arlting together, and the plate on each end extending beyond the overlapping of the joint into the solid body of the rm 2? A soft rubber drive ring of the character described provided with a split joint, said joint comprising overlappin ends with a reinforcing plate vulcamze to each end arranged for bolting together, and the plate on each end extending beyond the overlapping of the joint into the solid body of the ring, and terminating short of the extreme end to which it is vulcanized.

3. Asplitring-of the character described comprised of soft. rubber with an overla ping joint, a reinforcement incorporated 4n the joint, a threaded sleeve extending from one side of the. ring through the soft rubber 1 and through the reinforcement and a screw extending from the other side of the ring through the soft rubber and engaging thethreaded sleeve.

4. In combination a grooved machine element and a soft rubber friction drive ring provided vwith a split joint with overlapping ends, screws clamping the overlapping ends tfigethensaid ring adapted to be seated in t e structed so that the sides of the groove extend beyond the screws whereby the screws are retained a ainst displacement.

EORGE M. STEVENS.

grooved machine element and con- 

